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Steganography is only useful when no-one knows to look for it, if they do it is trivial to detect.


Not really trivial to detect steganography. There is whole body of work that focus on statistically undetectable data hiding [1]. Much of it is in confines of research labs, but it is still feasible.

[1] http://scholar.google.com/scholar?hl=en&q=secure+stegano...




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